642642105381 has 8 divisors (see below), whose sum is σ = 856896410400. Its totient is φ = 428407935312.

The previous prime is 642642105377. The next prime is 642642105397. The reversal of 642642105381 is 183501246246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642642105381 - 2² = 642642105377 is a prime.

It is a super-2 number, since 2×642642105381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642642104381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4959106 + ... + 5087043.

It is an arithmetic number, because the mean of its divisors is an integer number (107112051300).

Almost surely, 2^642642105381 is an apocalyptic number.

It is an amenable number.

642642105381 is a deficient number, since it is larger than the sum of its proper divisors (214254305019).

642642105381 is a wasteful number, since it uses less digits than its factorization.

642642105381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10067475.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 642642105381 in words is "six hundred forty-two billion, six hundred forty-two million, one hundred five thousand, three hundred eighty-one".